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require File.dirname(__FILE__) + '/../../spec_helper'
require 'set'
describe "Set#subset?" do
before(:each) do
@set = Set[1, 2, 3, 4]
end
it "returns true if passed a Set that is equal to self or self is a subset of" do
@set.subset?(@set).should be_true
Set[].subset?(Set[]).should be_true
Set[].subset?(@set).should be_true
Set[].subset?(Set[1, 2, 3]).should be_true
Set[].subset?(Set["a", :b, ?c]).should be_true
Set[1, 2, 3].subset?(@set).should be_true
Set[1, 3].subset?(@set).should be_true
Set[1, 2].subset?(@set).should be_true
Set[1].subset?(@set).should be_true
Set[5].subset?(@set).should be_false
Set[1, 5].subset?(@set).should be_false
Set[nil].subset?(@set).should be_false
Set["test"].subset?(@set).should be_false
end
it "raises an ArgumentError when passed a non-Set" do
lambda { Set[].subset?([]) }.should raise_error(ArgumentError)
lambda { Set[].subset?(1) }.should raise_error(ArgumentError)
lambda { Set[].subset?("test") }.should raise_error(ArgumentError)
lambda { Set[].subset?(Object.new) }.should raise_error(ArgumentError)
end
end
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